77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/* $NetBSD: mips_param.h,v 1.12 1999/02/09 17:15:52 tv Exp $ */
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/*
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* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE.
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* On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
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* to be the number of per-process-wired kernel-stack pages/PTES.
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*/
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#define SSIZE 1 /* initial stack size/NBPG */
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#define SINCR 1 /* increment of stack/NBPG */
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#define UPAGES 2 /* pages of u-area */
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#define USPACE (UPAGES*NBPG) /* size of u-area in bytes */
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#ifndef MSGBUFSIZE
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#define MSGBUFSIZE NBPG /* default message buffer size */
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#endif
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/*
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* Round p (pointer or byte index) up to a correctly-aligned value for all
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* data types (int, long, ...). The result is u_int and must be cast to
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* any desired pointer type.
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*
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* ALIGNED_POINTER is a boolean macro that checks whether an address
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* is valid to fetch data elements of type t from on this architecture.
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* This does not reflect the optimal alignment, just the possibility
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* (within reasonable limits).
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*
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*/
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#define ALIGNBYTES 7
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#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
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#define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0)
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#define NBPG 4096 /* bytes/page */
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#define PGOFSET (NBPG-1) /* byte offset into page */
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#define PGSHIFT 12 /* LOG2(NBPG) */
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#define NPTEPG (NBPG/4)
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#define NBSEG 0x400000 /* bytes/segment */
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#define SEGOFSET (NBSEG-1) /* byte offset into segment */
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#define SEGSHIFT 22 /* LOG2(NBSEG) */
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/*
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* Size of kernel malloc arena in CLBYTES-sized logical pages
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*/
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#ifndef NKMEMCLUSTERS
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#define NKMEMCLUSTERS (6 * 1024 * 1024 / CLBYTES)
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#endif
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/* pages ("clicks") (4096 bytes) to disk blocks */
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#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
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#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
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/* pages to bytes */
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#define ctob(x) ((x) << PGSHIFT)
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#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
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/* bytes to disk blocks */
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#define btodb(x) ((x) >> DEV_BSHIFT)
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#define dbtob(x) ((x) << DEV_BSHIFT)
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/*
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* Map a ``block device block'' to a file system block.
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* This should be device dependent, and should use the bsize
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* field from the disk label.
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* For now though just use DEV_BSIZE.
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*/
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#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
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/*
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* Mach derived conversion macros
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*/
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#define mips_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
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#define mips_trunc_page(x) ((unsigned)(x) & ~(NBPG-1))
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#define mips_btop(x) ((unsigned)(x) >> PGSHIFT)
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#define mips_ptob(x) ((unsigned)(x) << PGSHIFT)
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